dreams about/ of it

"About" would sound more natural, but you need to fix the two comma splices.

Thank you so much, Teechr.
I don't quite understand the part "the two comma splices" in your answer.
Could you explain it if you don't mind?

seagullall the time, he dreams

seagullof it, he talks

These are comma splices. The comma doesn't work here. You can either use a full stop to end the sentence and start a new one, or you could try using a conjunction.

Try fixing your text and post back.

I think the commas are acceptable, though I would be tempted to insert another one before "and."

The second sentence can be thought of as a list of things that "he" does, but opinions on this may vary.

ozzourtiI think the commas are acceptable

I disagree.

ozzourtiThe second sentence can be thought of as a list of things

Yes, but the second and third "he" would have to be deleted to make it grammatical.

I personally think that periods would make the reader pause for too long. If we use commas instead, the sentence becomes a little more dramatic.

teechrTry fixing your text and post back.

He loves his job. He thinks about his work all the time. Because of this, he always dreams about it and talks about it forever. I'm fed up with hearing about it.

I altered the sentence a bit following your advice. I think it is more concise than the original sentence. What do you think?

By the way, teechr, would you use periods here as well?—

Yesterday, I went swimming, my brother went shopping, and my parents went sightseeing.

Notice that each of the clauses is grammatically complete and independent.

Thank you very much, Ozzourti.
I've learned a lot from you, too.

seagullHe loves his job. He thinks about his work all the time. Because of this, he always dreams about it and talks about it forever. I'm fed up with hearing about it.

That's OK.
You could have also written:
He loves his job. He thinks about his work all the time, dreams about it, talks about it, and I'm fed up with hearing about it.